US5080072A - Air-fuel ratio control system for engine - Google Patents

Air-fuel ratio control system for engine Download PDF

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Publication number
US5080072A
US5080072A US07/623,529 US62352990A US5080072A US 5080072 A US5080072 A US 5080072A US 62352990 A US62352990 A US 62352990A US 5080072 A US5080072 A US 5080072A
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US
United States
Prior art keywords
air
fuel ratio
value
sensor
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/623,529
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English (en)
Inventor
Tetsushi Hosokai
Tetsuro Takaba
Toshihiro Ishihara
Hideki Kobayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mazda Motor Corp
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Mazda Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Assigned to MAZDA MOTOR CORPORATION, A CORP. OF JAPAN reassignment MAZDA MOTOR CORPORATION, A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HOSOKAI, TETSUSHI, ISHIHARA, TOSHIHIRO, KOBAYASHI, HIDEKI, TAKABA, TETSURO
Application filed by Mazda Motor Corp filed Critical Mazda Motor Corp
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Publication of US5080072A publication Critical patent/US5080072A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1493—Details
    • F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
    • F02D41/148—Using a plurality of comparators

Definitions

  • the controller performs the following learning control together with the feedback correction in order to compensate for fluctuation in the basic air-fuel ratio due to variation and/or change with time in properties of various parts such as the engine, the airflow meter, the injector and the like.
  • the primary object of the present invention is to provide an air-fuel ratio control system for an engine which can more accurately determine whether the air-fuel ratio sensor is active and/or whether the air-fuel ratio control system is abnormal, thereby controlling the air-fuel ratio with a higher accuracy.
  • the controller 8 determines in step S14 whether the output voltage Va of the O 2 sensor 16 as read in step S3 is higher than the preset maximum output value Vmax. When it is determined that the former is higher than the latter, the controller 8 proceeds to step S15 and updates the preset maximum output value Vmax by substituting the former for the latter. Thereafter the controller 8 proceeds to the calculation routine.
  • the preset maximum output value Vmax and the preset minimum output value Vmin cannot return to the original values and the difference Vmax-Vmin is gradually reduced and can finally become smaller than the reference difference ⁇ .
  • the difference Vmax-Vmin is gradually reduced and can finally become smaller than the reference difference ⁇ .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
US07/623,529 1989-12-08 1990-12-07 Air-fuel ratio control system for engine Expired - Lifetime US5080072A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1317811A JP2832049B2 (ja) 1989-12-08 1989-12-08 エンジンの空燃比制御装置
JP1-317811 1989-12-08

Publications (1)

Publication Number Publication Date
US5080072A true US5080072A (en) 1992-01-14

Family

ID=18092308

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/623,529 Expired - Lifetime US5080072A (en) 1989-12-08 1990-12-07 Air-fuel ratio control system for engine

Country Status (3)

Country Link
US (1) US5080072A (enrdf_load_stackoverflow)
JP (1) JP2832049B2 (enrdf_load_stackoverflow)
DE (1) DE4039124A1 (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5170769A (en) * 1990-02-10 1992-12-15 Robert Bosch Gmbh System for controlling an internal combustion engine in a motor vehicle
US5224453A (en) * 1990-02-10 1993-07-06 Robert Bosch Gmbh System for open-loop controlling and/or closed-loop controlling an internal combustion engine
US5243954A (en) * 1992-12-18 1993-09-14 Dresser Industries, Inc. Oxygen sensor deterioration detection
US5335539A (en) * 1991-08-30 1994-08-09 Ford Motor Company Onboard detection of oxygen sensor switch rate for determining air/fuel ratio control system failure
EP0616121A1 (en) * 1993-03-15 1994-09-21 Ford Motor Company Exhaust gas oxygen sensor
EP1267061A3 (de) * 2001-06-15 2004-11-17 Audi Ag Verfahren zur Diagnose einer Abgassonde
AU2016201876B2 (en) * 2015-03-31 2017-09-28 Toyota Jidosha Kabushiki Kaisha Exhaust purification system of internal combustion engine
WO2022214279A1 (de) * 2021-04-07 2022-10-13 Robert Bosch Gmbh Verfahren zum überprüfen eines massen- und/oder volumenstromsensors

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5824610A (ja) * 1981-07-31 1983-02-14 株式会社クボタ 組込管の相互固定具
US4408584A (en) * 1980-07-16 1983-10-11 Fuji Jukogyo Kabushiki Kaisha Air-fuel ratio control system
US4751908A (en) * 1984-07-20 1988-06-21 Fuji Jukogyo Kabushiki Kaisha Learning control system for controlling the air-fuel ratio for an automotive engine
US5020499A (en) * 1989-06-16 1991-06-04 Ngk Spark Plug Co., Ltd. Apparatus for detecting abnormality of oxygen sensor and controlling air/fuel ratio

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5827857A (ja) * 1981-08-12 1983-02-18 Mitsubishi Electric Corp 空燃比制御方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408584A (en) * 1980-07-16 1983-10-11 Fuji Jukogyo Kabushiki Kaisha Air-fuel ratio control system
JPS5824610A (ja) * 1981-07-31 1983-02-14 株式会社クボタ 組込管の相互固定具
US4751908A (en) * 1984-07-20 1988-06-21 Fuji Jukogyo Kabushiki Kaisha Learning control system for controlling the air-fuel ratio for an automotive engine
US5020499A (en) * 1989-06-16 1991-06-04 Ngk Spark Plug Co., Ltd. Apparatus for detecting abnormality of oxygen sensor and controlling air/fuel ratio

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5170769A (en) * 1990-02-10 1992-12-15 Robert Bosch Gmbh System for controlling an internal combustion engine in a motor vehicle
US5224453A (en) * 1990-02-10 1993-07-06 Robert Bosch Gmbh System for open-loop controlling and/or closed-loop controlling an internal combustion engine
US5335539A (en) * 1991-08-30 1994-08-09 Ford Motor Company Onboard detection of oxygen sensor switch rate for determining air/fuel ratio control system failure
US5243954A (en) * 1992-12-18 1993-09-14 Dresser Industries, Inc. Oxygen sensor deterioration detection
EP0616121A1 (en) * 1993-03-15 1994-09-21 Ford Motor Company Exhaust gas oxygen sensor
US5357791A (en) * 1993-03-15 1994-10-25 Ford Motor Company OBD-II exhaust gas oxygen sensor
EP1267061A3 (de) * 2001-06-15 2004-11-17 Audi Ag Verfahren zur Diagnose einer Abgassonde
AU2016201876B2 (en) * 2015-03-31 2017-09-28 Toyota Jidosha Kabushiki Kaisha Exhaust purification system of internal combustion engine
WO2022214279A1 (de) * 2021-04-07 2022-10-13 Robert Bosch Gmbh Verfahren zum überprüfen eines massen- und/oder volumenstromsensors

Also Published As

Publication number Publication date
JPH03179151A (ja) 1991-08-05
DE4039124C2 (enrdf_load_stackoverflow) 1993-02-11
JP2832049B2 (ja) 1998-12-02
DE4039124A1 (de) 1991-06-13

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